Finding the Third Proportional to 428,840.50 and 628,938

Step by Step Solution

1. Step 1: Write the proportion equation
   428,840.50 : 628,938 = 628,938 : x
2. Step 2: Convert to fraction form
   428,840.50/628,938 = 628,938/x
3. Step 3: Cross multiply
   428,840.50x = 628,938 × 628,938
4. Step 4: Simplify right side
   428,840.50x = 395,563,007,844
5. Step 5: Solve for x
   x = 395,563,007,844/428,840.50
6. Step 6: Final answer
   x = 922,401.24